With each stride, the updated Nike Free midsole's unique structure expands and contracts in all directions, following the natural motion of your foot. Plush Cushioning

An ultra-soft foam midsole helps to cushion impact while giving you a plush feel from the whistle to the finish line. Sock-Like Fit

A near-seamless Flyknit upper hugs your foot for a locked-in feel and lightweight, breathable support on every run. More Details Rubber pods on the outsole for traction and durability Flywire cables provide a snug, adaptive fit Added structure in the heel enhances lockdown Nike Free Origins

After learning that Stanford athletes had been training barefoot on the university's golf course, three of Nike's most innovative and creative employees set out to develop a shoe that felt natural and weightless, similar to bare feet. The team spent eight years studying the biomechanics of runners' feet in motion. The results yielded a profound understanding of the foot's natural landing angle, pressure and toe position, allowing Nike designers to build an unconventional and flexible running shoe from the inside out. Flyknit Origins Nike Flyknit technology was inspired by feedback from runners craving a shoe with the snug (and virtually unnoticed) fit of a sock. Nike embarked on a four-year mission with teams of programmers, engineers and designers to create the technology needed to make the knit upper with static properties for structure and durability. Then the precise placement of support, flexibility and breathabilityall in one layerwas refined. The result is a featherweight, formfitting and virtually seamless upper.